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Investment Gains and Losses Reported in Consolidated Statements of Income (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Fixed Maturity Securities        
Gross Gains on Sales [1] $ 139.2 $ 1.1 $ 141.0 $ 1.1
Gross Losses on Sales [1] (11.5) (8.5) (71.5) (29.7)
Impairment Loss [1] 0.0 (1.3) (160.9) (2.5)
credit losses (0.8) (0.2) (12.4) (3.1)
Other Investments        
Gross Gains on Sales 0.2 0.4 7.6 0.4
Other Investments Gross Realized Losses 0.0 0.0 (0.4) 0.0
Impairment Loss 1.6 0.0 5.4 0.0
Current Period Provisions 0.0 4.5 (0.5) 6.4
Embedded Derivative in Modified Coinsurance Arrangement 3.3 (0.8) 2.4 6.1
All Other Derivatives 0.1 (2.2) (3.1) (0.2)
Foreign Currency Transactions (0.9) 3.1 5.7 0.5
Other Realized Gain 0.0 0.0 0.0 9.3
Net Investment Gain (Loss) $ 128.0 $ (12.9) $ (96.5) $ (24.5)
[1] 1Our investment gains and losses on fixed maturity securities for the third quarter and first nine months of 2025 were driven primarily by the Closed Block long-term care and Unum US individual disability reinsurance transaction (Fortitude Re reinsurance transaction) which resulted in a net gain of $137.6 million in the third quarter of 2025 and a net loss of $46.8 million in the first nine months of 2025. In addition, we realized a $19.1 million loss on sales of fixed maturity securities relating to funding of a dividend from one of our subsidiaries in the first nine months of 2025